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NNADVOKAT [17]
3 years ago
8

three resistors which values of 15 ohm 40 ohm 60 ohm respectively are connected in parallel. what is their equivalent resistance

? if a 115v potential difference is applied to the circuit, what is the total current through the circuit? provide a schematic diagram of the circuit.
Physics
1 answer:
VashaNatasha [74]3 years ago
7 0

1) Equivalent resistance, 1/R = 1/15 + 1/40 + 1/60 = 8+3+2 /120 = 13/120

R = 120/13 = 9.23

2) Current, I = V/R = 115/9.23 = 12.45 A



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Sound waves in air travel at approximately 330m/s. Calculate the frequency of a 2.5m-long sound wave.
dusya [7]
Frequency = speed ÷ wavelength
= 330m/s ÷ 2.5m
= 132 Hz
8 0
3 years ago
A beam of light strikes a sheet of glass at an angle of 57.0° with the normal in air. You observe that red light makes an angle
Contact [7]
<h2>Answers: </h2>

1) 1.359, 1.403

2) 2.207(10)^{8}m/s,  2.138(10)^{8}m/s    

Explanation:

The described situation is known as Refraction.  

Refraction is a phenomenon in which a wave (the light in this case) bends or changes it direction when passing through a medium with a refractive index different from the other medium.  

In this context, the Refractive index n is a number that describes how fast light propagates through a medium or material, and is defined as the relation between the speed of light in vacuum (c=3(10)^{8}m/s) and the speed of light v in the second medium:

n=\frac{c}{v}   (1)

On the other hand we have the Snell’s Law:  

n_{1}sin(\theta_{1})=n_{2}sin(\theta_{2})   (2)  

Where:  

n_{1} is the first medium refractive index . We are told is the air, hence n_{1}\approx 1

n_{2} is the second medium refractive index  

\theta_{1} is the angle of the incident ray  

\theta_{2} is the angle of the refracted ray  

Knowing this, let's begin with the answers:

<h2><u>1) Indexes of refraction for red and violet light</u></h2><h2 /><h2>1a) Red light</h2>

Using equation (2) according to Snell's Law and \theta_{1}=57.0\º   \theta_{2}=38.1\º:

(1)sin(57.0\º)=n_{2}sin(38.1\º)  

Finding n_{2}:

n_{2}=\frac{sin(57.0\º)}{sin(38.1\º)}  

n_{2}=1.359   (3)>>>Index of Refraction for red light

<h2>1b) Violet light</h2>

Again, using equation (2) according to Snell's Law and \theta_{1}=57.0\º   \theta_{2}=36.7\º:

(1)sin(57.0\º)=n_{2}sin(36.7\º)  

Finding n_{2}:

n_{2}=\frac{sin(57.0\º)}{sin(36.7\º)}  

n_{2}=1.403   (4) >>>Index of Refraction for violet light

<h2><u>2) Speeds of red and violet light</u></h2><h2 /><h2>1a) Red light</h2>

Here we are going to use equation (1):

n_{red}=\frac{c}{v_{red}}

v_{red}=\frac{c}{n_{red}}

Substituting (3) in this equation:

v_{red}=\frac{3(10)^{8}m/s}{1.359}

v_{red}=2.207(10)^{8}m/s >>>>Speed of red light

<h2>1a) Violet light</h2>

Using again equation (1):

n_{violet}=\frac{c}{v_{violet}}

v_{violet}=\frac{c}{n_{violet}}

Substituting (4) in this equation:

v_{violet}=\frac{3(10)^{8}m/s}{1.403}

v_{red}=2.138(10)^{8}m/s >>>>Speed of violet light

3 0
3 years ago
URGENT DUE IN HALF AN HOUR:
Umnica [9.8K]
If all the sides are equal, then it is an equilateral triangle. This means after walking 100 meters, you had to turn 1/3 of 180 degrees (because that's what the interior angles of the triangle add up to).

So, 180 * 1/3 = 60 degrees.

We aren't done yet.

60 degrees is not the angle which you have turned from your path.

You turned 120 degrees to describe an angle of 60 degrees on the interior side.

The answer is B.
7 0
3 years ago
calculating power reach each scenario and then answer the questions scenario a 120 j of work is done in 6 seconds scenario b 160
Molodets [167]

Answer: scenario b and scenario c uses most power

Explanation:

Scenario a:

Work=120J

Time=8 seconds

Power=work ➗ time

Power=120 ➗ 8

Power=15

Power=15 watts

Scenario b:

Work=160J

Time=8 seconds

Power=work ➗ time

Power=160 ➗ 8

Power=20

Power =20 watts

Scenario c:

Work=200J

Time=10 seconds

Power= work ➗ time

Power=200 ➗ 10

Power=20

Power=20 watts

Scenario b and scenario c uses most power

4 0
3 years ago
Considering , will F ever equal zero?
Kamila [148]
No it will not because F will equal 3 not 0

4 0
3 years ago
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